gecko/dom/system/gonk/nsVolumeService.cpp

455 lines
13 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsVolumeService.h"
#include "Volume.h"
#include "VolumeManager.h"
#include "VolumeServiceIOThread.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsDependentSubstring.h"
#include "nsIDOMWakeLockListener.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIPowerManagerService.h"
#include "nsISupportsUtils.h"
#include "nsIVolume.h"
#include "nsIVolumeService.h"
#include "nsLocalFile.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
#include "nsVolumeMountLock.h"
#include "nsXULAppAPI.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Services.h"
#define VOLUME_MANAGER_LOG_TAG "nsVolumeService"
#include "VolumeManagerLog.h"
#include <stdlib.h>
using namespace mozilla::dom;
using namespace mozilla::services;
namespace mozilla {
namespace system {
NS_IMPL_ISUPPORTS2(nsVolumeService,
nsIVolumeService,
nsIDOMMozWakeLockListener)
StaticRefPtr<nsVolumeService> nsVolumeService::sSingleton;
// static
already_AddRefed<nsVolumeService>
nsVolumeService::GetSingleton()
{
MOZ_ASSERT(NS_IsMainThread());
if (!sSingleton) {
sSingleton = new nsVolumeService();
}
nsRefPtr<nsVolumeService> volumeService = sSingleton.get();
return volumeService.forget();
}
// static
void
nsVolumeService::Shutdown()
{
if (!sSingleton) {
return;
}
if (XRE_GetProcessType() != GeckoProcessType_Default) {
sSingleton = nullptr;
return;
}
nsCOMPtr<nsIPowerManagerService> pmService =
do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (pmService) {
pmService->RemoveWakeLockListener(sSingleton.get());
}
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(ShutdownVolumeServiceIOThread));
sSingleton = nullptr;
}
nsVolumeService::nsVolumeService()
: mArrayMonitor("nsVolumeServiceArray")
{
sSingleton = this;
if (XRE_GetProcessType() != GeckoProcessType_Default) {
// Request the initial state for all volumes.
ContentChild::GetSingleton()->SendBroadcastVolume(NS_LITERAL_STRING(""));
return;
}
// Startup the IOThread side of things. The actual volume changes
// are captured by the IOThread and forwarded to main thread.
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(InitVolumeServiceIOThread, this));
nsCOMPtr<nsIPowerManagerService> pmService =
do_GetService(POWERMANAGERSERVICE_CONTRACTID);
if (!pmService) {
return;
}
pmService->AddWakeLockListener(this);
}
nsVolumeService::~nsVolumeService()
{
}
// Callback for nsIDOMMozWakeLockListener
NS_IMETHODIMP
nsVolumeService::Callback(const nsAString& aTopic, const nsAString& aState)
{
CheckMountLock(aTopic, aState);
return NS_OK;
}
NS_IMETHODIMP
nsVolumeService::BroadcastVolume(const nsAString& aVolName)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
if (aVolName.EqualsLiteral("")) {
nsVolume::Array volumeArray;
{
// Copy the array since we don't want to call BroadcastVolume
// while we're holding the lock.
MonitorAutoLock autoLock(mArrayMonitor);
volumeArray = mVolumeArray;
}
// We treat being passed the empty string as "broadcast all volumes"
nsVolume::Array::size_type numVolumes = volumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
const nsString& volName(volumeArray[volIndex]->Name());
if (!volName.EqualsLiteral("")) {
// Note: The volume service is the only entity that should be able to
// modify the array of volumes. So we shouldn't have any issues with
// the array being modified under our feet (Since we're the volume
// service the array can't change until after we finish iterating the
// the loop).
nsresult rv = BroadcastVolume(volName);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsRefPtr<nsVolume> vol;
{
MonitorAutoLock autoLock(mArrayMonitor);
vol = FindVolumeByName(aVolName);
}
if (!vol) {
ERR("BroadcastVolume: Unable to locate volume '%s'",
NS_LossyConvertUTF16toASCII(aVolName).get());
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIObserverService> obs = GetObserverService();
NS_ENSURE_TRUE(obs, NS_NOINTERFACE);
DBG("nsVolumeService::BroadcastVolume for '%s'", vol->NameStr().get());
NS_ConvertUTF8toUTF16 stateStr(vol->StateStr());
obs->NotifyObservers(vol, NS_VOLUME_STATE_CHANGED, stateStr.get());
return NS_OK;
}
NS_IMETHODIMP nsVolumeService::GetVolumeByName(const nsAString& aVolName, nsIVolume **aResult)
{
MonitorAutoLock autoLock(mArrayMonitor);
nsRefPtr<nsVolume> vol = FindVolumeByName(aVolName);
if (!vol) {
return NS_ERROR_NOT_AVAILABLE;
}
vol.forget(aResult);
return NS_OK;
}
NS_IMETHODIMP
nsVolumeService::GetVolumeByPath(const nsAString& aPath, nsIVolume **aResult)
{
NS_ConvertUTF16toUTF8 utf8Path(aPath);
char realPathBuf[PATH_MAX];
while (realpath(utf8Path.get(), realPathBuf) < 0) {
if (errno != ENOENT) {
ERR("GetVolumeByPath: realpath on '%s' failed: %d", utf8Path.get(), errno);
return NSRESULT_FOR_ERRNO();
}
// The pathname we were passed doesn't exist, so we try stripping off trailing
// components until we get a successful call to realpath, or until we run out
// of components (if we finally get to /something then we also stop).
int32_t slashIndex = utf8Path.RFindChar('/');
if ((slashIndex == kNotFound) || (slashIndex == 0)) {
errno = ENOENT;
ERR("GetVolumeByPath: realpath on '%s' failed.", utf8Path.get());
return NSRESULT_FOR_ERRNO();
}
utf8Path.Assign(Substring(utf8Path, 0, slashIndex));
}
// The volume mount point is always a directory. Something like /mnt/sdcard
// Once we have a full qualified pathname with symlinks removed (which is
// what realpath does), we basically check if aPath starts with the mount
// point, but we don't want to have /mnt/sdcard match /mnt/sdcardfoo but we
// do want it to match /mnt/sdcard/foo
// So we add a trailing slash to the mount point and the pathname passed in
// prior to doing the comparison.
strlcat(realPathBuf, "/", sizeof(realPathBuf));
MonitorAutoLock autoLock(mArrayMonitor);
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
NS_ConvertUTF16toUTF8 volMountPointSlash(vol->MountPoint());
volMountPointSlash.Append(NS_LITERAL_CSTRING("/"));
nsDependentCSubstring testStr(realPathBuf, volMountPointSlash.Length());
if (volMountPointSlash.Equals(testStr)) {
vol.forget(aResult);
return NS_OK;
}
}
return NS_ERROR_FILE_NOT_FOUND;
}
NS_IMETHODIMP
nsVolumeService::CreateOrGetVolumeByPath(const nsAString& aPath, nsIVolume** aResult)
{
nsresult rv = GetVolumeByPath(aPath, aResult);
if (rv == NS_OK) {
return NS_OK;
}
// In order to support queries by the updater, we will fabricate a volume
// from the pathname, so that the caller can determine the volume size.
nsCOMPtr<nsIVolume> vol = new nsVolume(NS_LITERAL_STRING("fake"),
aPath, nsIVolume::STATE_MOUNTED,
-1 /*generation*/);
vol.forget(aResult);
return NS_OK;
}
NS_IMETHODIMP
nsVolumeService::GetVolumeNames(nsTArray<nsString>& aVolNames)
{
MonitorAutoLock autoLock(mArrayMonitor);
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
aVolNames.AppendElement(vol->Name());
}
return NS_OK;
}
NS_IMETHODIMP
nsVolumeService::CreateMountLock(const nsAString& aVolumeName, nsIVolumeMountLock **aResult)
{
nsCOMPtr<nsIVolumeMountLock> mountLock = nsVolumeMountLock::Create(aVolumeName);
if (!mountLock) {
return NS_ERROR_NOT_AVAILABLE;
}
mountLock.forget(aResult);
return NS_OK;
}
void
nsVolumeService::CheckMountLock(const nsAString& aMountLockName,
const nsAString& aMountLockState)
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
nsRefPtr<nsVolume> vol = FindVolumeByMountLockName(aMountLockName);
if (vol) {
vol->UpdateMountLock(aMountLockState);
}
}
already_AddRefed<nsVolume>
nsVolumeService::FindVolumeByMountLockName(const nsAString& aMountLockName)
{
MonitorAutoLock autoLock(mArrayMonitor);
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
nsString mountLockName;
vol->GetMountLockName(mountLockName);
if (mountLockName.Equals(aMountLockName)) {
return vol.forget();
}
}
return nullptr;
}
already_AddRefed<nsVolume>
nsVolumeService::FindVolumeByName(const nsAString& aName)
{
mArrayMonitor.AssertCurrentThreadOwns();
nsVolume::Array::size_type numVolumes = mVolumeArray.Length();
nsVolume::Array::index_type volIndex;
for (volIndex = 0; volIndex < numVolumes; volIndex++) {
nsRefPtr<nsVolume> vol = mVolumeArray[volIndex];
if (vol->Name().Equals(aName)) {
return vol.forget();
}
}
return nullptr;
}
//static
already_AddRefed<nsVolume>
nsVolumeService::CreateOrFindVolumeByName(const nsAString& aName, bool aIsFake /*= false*/)
{
MonitorAutoLock autoLock(mArrayMonitor);
nsRefPtr<nsVolume> vol;
vol = FindVolumeByName(aName);
if (vol) {
return vol.forget();
}
// Volume not found - add a new one
vol = new nsVolume(aName);
vol->SetIsFake(aIsFake);
mVolumeArray.AppendElement(vol);
return vol.forget();
}
void
nsVolumeService::UpdateVolume(nsIVolume* aVolume)
{
MOZ_ASSERT(NS_IsMainThread());
nsString volName;
aVolume->GetName(volName);
bool aIsFake;
aVolume->GetIsFake(&aIsFake);
nsRefPtr<nsVolume> vol = CreateOrFindVolumeByName(volName, aIsFake);
if (vol->Equals(aVolume)) {
// Nothing has really changed. Don't bother telling anybody.
return;
}
if (!vol->IsFake() && aIsFake) {
// Prevent an incoming fake volume from overriding an existing real volume.
return;
}
vol->Set(aVolume);
nsCOMPtr<nsIObserverService> obs = GetObserverService();
if (!obs) {
return;
}
NS_ConvertUTF8toUTF16 stateStr(vol->StateStr());
obs->NotifyObservers(vol, NS_VOLUME_STATE_CHANGED, stateStr.get());
}
NS_IMETHODIMP
nsVolumeService::CreateFakeVolume(const nsAString& name, const nsAString& path)
{
if (XRE_GetProcessType() == GeckoProcessType_Default) {
nsRefPtr<nsVolume> vol = new nsVolume(name, path, nsIVolume::STATE_INIT, -1);
vol->SetIsFake(true);
vol->LogState();
UpdateVolume(vol.get());
return NS_OK;
}
ContentChild::GetSingleton()->SendCreateFakeVolume(nsString(name), nsString(path));
return NS_OK;
}
NS_IMETHODIMP
nsVolumeService::SetFakeVolumeState(const nsAString& name, int32_t state)
{
if (XRE_GetProcessType() == GeckoProcessType_Default) {
nsRefPtr<nsVolume> vol;
{
MonitorAutoLock autoLock(mArrayMonitor);
vol = FindVolumeByName(name);
}
if (!vol || !vol->IsFake()) {
return NS_ERROR_NOT_AVAILABLE;
}
vol->SetState(state);
vol->LogState();
UpdateVolume(vol.get());
return NS_OK;
}
ContentChild::GetSingleton()->SendSetFakeVolumeState(nsString(name), state);
return NS_OK;
}
/***************************************************************************
* The UpdateVolumeRunnable creates an nsVolume and updates the main thread
* data structure while running on the main thread.
*/
class UpdateVolumeRunnable : public nsRunnable
{
public:
UpdateVolumeRunnable(nsVolumeService* aVolumeService, const Volume* aVolume)
: mVolumeService(aVolumeService),
mVolume(new nsVolume(aVolume))
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
}
NS_IMETHOD Run()
{
MOZ_ASSERT(NS_IsMainThread());
DBG("UpdateVolumeRunnable::Run '%s' state %s gen %d locked %d",
mVolume->NameStr().get(), mVolume->StateStr(),
mVolume->MountGeneration(), (int)mVolume->IsMountLocked());
mVolumeService->UpdateVolume(mVolume);
mVolumeService = nullptr;
mVolume = nullptr;
return NS_OK;
}
private:
nsRefPtr<nsVolumeService> mVolumeService;
nsRefPtr<nsVolume> mVolume;
};
void
nsVolumeService::UpdateVolumeIOThread(const Volume* aVolume)
{
DBG("UpdateVolumeIOThread: Volume '%s' state %s mount '%s' gen %d locked %d",
aVolume->NameStr(), aVolume->StateStr(), aVolume->MountPoint().get(),
aVolume->MountGeneration(), (int)aVolume->IsMountLocked());
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
NS_DispatchToMainThread(new UpdateVolumeRunnable(this, aVolume));
}
} // namespace system
} // namespace mozilla